Second Generation Singlespeed
SingleSpeed Biking

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After progressing from the Moots to my first home made bike with made for singlespeed geometry I wanted to go even further with the geometry. I wanted something I could really stand up on and crank. That meant higher bars for a straighter back when standing and tucking the rear wheel in close so that more weight would be over it when standing. That should reduce the tendency for the rear wheel to spin out on the loose trails. I wasn't too worried about getting the center of gravity too far back since I would always be standing for anything except the casual cruising and then it wouldn't matter.

It all came together. Here it is built up with some new parts and some old ones. Notice the location of the bottom bracket relative to the seat tube. The seat tube is not attached directly to the bottom bracket. It has been moved forward to give the rear wheel room to move forward further under the seat.

After riding the bike a dozen time I really like the feel. The front end is light but I've gotten used to it and it does hook up nicely on the loose or muddy climbs. It turns well and stays underneath me on the technical stuff. All in all I like the geometry.

A view from the other side makes it more clear how the seat tube is attached. The height of the head tube is extra long. That put the bars up at the same height as the seat.

The powercoat has the same look as that found on many shop tools and vises. I wanted something that was different.

Here are some shots of the frame after powdercoating but before it was built up. Click on the pictures to see a larger version. Notice the way the chainstays join to the bottom bracket. With the rear wheel tucked in so tight it was tough to get enough clearance for a 2.3 inch tire.

There isn't much room to spare when a 2.3 inch tire is slide all the way forward in the dropouts but it does clear the chainstays. The dropouts have extra long slots so for wider tires an extra link in the chain will allow the wheel to sit further back and give more tire clearance. The dropout is the one originally planned for the first bike I made.

This is the drawing I started from. It took a lot of playing to get everything to fit and line up correctly. The bike came out pretty much as planned.